TG 123 then UB 20 at Bangkok
Chiang Mai → Bangkok → Yangon
Timetable, Bangkok time
12:30TG 123 from Chiang Mai at the gate
09:25UB 20 to Yangon leaves the gate
20 h 55 apart on the timetable, overnight
UB 20 leaves 20 h 55 after TG 123 arrives on the timetable: more than half a day, so not a connection we count.